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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rmd128.h,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The RIPEMD-128 message digest function |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
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18 | * |
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19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
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23 | * |
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24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | /*----- Notes on the RIPEMD-128 hash function -----------------------------* |
31 | * |
32 | * RIPEMD-128 was invented by Hans Dobbertin, Antoon Bosselaers and Bart |
33 | * Preneel, as a drop-in replacement for MD5 (with the same sized output). |
34 | * It's a cut-down version of RIPEMD-160, which should be used in preference. |
35 | */ |
36 | |
37 | #ifndef CATACOMB_RMD128_H |
38 | #define CATACOMB_RMD128_H |
39 | |
40 | #ifdef __cplusplus |
41 | extern "C" { |
42 | #endif |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | #include <mLib/bits.h> |
47 | |
48 | #ifndef CATACOMB_GHASH_H |
49 | # include "ghash.h" |
50 | #endif |
51 | |
52 | /*----- Magic numbers -----------------------------------------------------*/ |
53 | |
54 | #define RMD128_BUFSZ 64 |
55 | #define RMD128_HASHSZ 16 |
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56 | #define RMD128_STATESZ 16 |
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57 | |
58 | /*----- Data structures ---------------------------------------------------*/ |
59 | |
60 | typedef struct rmd128_ctx { |
61 | uint32 a, b, c, d; /* Chaining variables */ |
62 | uint32 nl, nh; /* Byte count so far */ |
63 | unsigned off; /* Offset into buffer */ |
64 | octet buf[RMD128_BUFSZ]; /* Accumulation buffer */ |
65 | } rmd128_ctx; |
66 | |
67 | /*----- Functions provided ------------------------------------------------*/ |
68 | |
69 | /* --- @rmd128_compress@ --- * |
70 | * |
71 | * Arguments: @rmd128_ctx *ctx@ = pointer to context block |
72 | * @const void *sbuf@ = pointer to buffer of appropriate size |
73 | * |
74 | * Returns: --- |
75 | * |
76 | * Use: RIPEMD-128 compression function. |
77 | */ |
78 | |
79 | extern void rmd128_compress(rmd128_ctx */*ctx*/, const void */*sbuf*/); |
80 | |
81 | /* --- @rmd128_init@ --- * |
82 | * |
83 | * Arguments: @rmd128_ctx *ctx@ = pointer to context block to initialize |
84 | * |
85 | * Returns: --- |
86 | * |
87 | * Use: Initializes a context block ready for hashing. |
88 | */ |
89 | |
90 | extern void rmd128_init(rmd128_ctx */*ctx*/); |
91 | |
92 | /* --- @rmd128_set@ --- * |
93 | * |
94 | * Arguments: @rmd128_ctx *ctx@ = pointer to context block |
95 | * @const void *buf@ = pointer to state buffer |
96 | * @unsigned long count@ = current count of bytes processed |
97 | * |
98 | * Returns: --- |
99 | * |
100 | * Use: Initializes a context block from a given state. This is |
101 | * useful in cases where the initial hash state is meant to be |
102 | * secret, e.g., for NMAC and HMAC support. |
103 | */ |
104 | |
105 | extern void rmd128_set(rmd128_ctx */*ctx*/, |
106 | const void */*buf*/, unsigned long /*count*/); |
107 | |
108 | /* --- @rmd128_hash@ --- * |
109 | * |
110 | * Arguments: @rmd128_ctx *ctx@ = pointer to context block |
111 | * @const void *buf@ = buffer of data to hash |
112 | * @size_t sz@ = size of buffer to hash |
113 | * |
114 | * Returns: --- |
115 | * |
116 | * Use: Hashes a buffer of data. The buffer may be of any size and |
117 | * alignment. |
118 | */ |
119 | |
120 | extern void rmd128_hash(rmd128_ctx */*ctx*/, |
121 | const void */*buf*/, size_t /*sz*/); |
122 | |
123 | /* --- @rmd128_done@ --- * |
124 | * |
125 | * Arguments: @rmd128_ctx *ctx@ = pointer to context block |
126 | * @void *hash@ = pointer to output buffer |
127 | * |
128 | * Returns: --- |
129 | * |
130 | * Use: Returns the hash of the data read so far. |
131 | */ |
132 | |
133 | extern void rmd128_done(rmd128_ctx */*ctx*/, void */*hash*/); |
134 | |
135 | /* --- @rmd128_state@ --- * |
136 | * |
137 | * Arguments: @rmd128_ctx *ctx@ = pointer to context |
138 | * @void *state@ = pointer to buffer for current state |
139 | * |
140 | * Returns: Number of bytes written to the hash function so far. |
141 | * |
142 | * Use: Returns the current state of the hash function such that |
143 | * it can be passed to @rmd128_set@. |
144 | */ |
145 | |
146 | extern unsigned long rmd128_state(rmd128_ctx */*ctx*/, void */*state*/); |
147 | |
148 | /*----- Generic hash interface --------------------------------------------*/ |
149 | |
150 | extern const gchash rmd128; |
151 | |
152 | /*----- That's all, folks -------------------------------------------------*/ |
153 | |
154 | #ifdef __cplusplus |
155 | } |
156 | #endif |
157 | |
158 | #endif |